It's a KM100 Transfer Case, and it can be found in front of the KM130 4-Speed Manual Transmission, The KM132 5-Speed Manual Transmission (goes by the name KM145 if it's a 4WD model), the MA904 3-Speed Automatic (A Chrysler Torqueflite 904. Goes by the name KM146 if it's a 4WD model) and The A500 4-Speed Overdrive Automatic (A Chrysler A500 Torqueflite Overdrive) I can't remember the name that one goes by in the D50's

The KM100 has a 2.0 to 1 Gear Reduction (4-Low) and a 1 to 1 Gear Ratio (2-High/4-High)